QTest::mouseClick() and mouseDClick() don't actually apply the delay to each event in the sequence

    static void mouseEvent(MouseAction action, QWindow *window, Qt::MouseButton button,
                           Qt::KeyboardModifiers stateKey, QPoint pos, int delay=-1)
    {
        QTEST_ASSERT(window);
        extern int Q_TESTLIB_EXPORT defaultMouseDelay();

        // pos is in window local coordinates
        const QSize windowSize = window->geometry().size();
        if (windowSize.width() <= pos.x() || windowSize.height() <= pos.y()) {
            qWarning("Mouse event at %d, %d occurs outside target window (%dx%d).",
                     pos.x(), pos.y(), windowSize.width(), windowSize.height());
        }

        int actualDelay = (delay == -1 || delay < defaultMouseDelay()) ? defaultMouseDelay() : delay;
        lastMouseTimestamp += qMax(1, actualDelay);

        if (pos.isNull())
            pos = QPoint(window->width() / 2, window->height() / 2);

        QTEST_ASSERT(!stateKey || stateKey & Qt::KeyboardModifierMask);

        stateKey &= Qt::KeyboardModifierMask;

        QPointF global = window->mapToGlobal(pos);
        QPointer<QWindow> w(window);

        using namespace QTestPrivate;
        switch (action)
        {
        case MouseDClick:
            qtestMouseButtons.setFlag(button, true);
            qt_handleMouseEvent(w, pos, global, qtestMouseButtons, button, QEvent::MouseButtonPress,
                                stateKey, lastMouseTimestamp);
            qtestMouseButtons.setFlag(button, false);
            qt_handleMouseEvent(w, pos, global, qtestMouseButtons, button, QEvent::MouseButtonRelease,
                                stateKey, lastMouseTimestamp);
            Q_FALLTHROUGH();
        case MousePress:
        case MouseClick:
            qtestMouseButtons.setFlag(button, true);
            qt_handleMouseEvent(w, pos, global, qtestMouseButtons, button, QEvent::MouseButtonPress,
                                stateKey, lastMouseTimestamp);
            if (action == MousePress)
                break;
            Q_FALLTHROUGH();
        case MouseRelease:
            qtestMouseButtons.setFlag(button, false);
            qt_handleMouseEvent(w, pos, global, qtestMouseButtons, button, QEvent::MouseButtonRelease,
                                stateKey, lastMouseTimestamp);
            if (delay == -1)
                lastMouseTimestamp += mouseDoubleClickInterval; // avoid double clicks being generated
            break;